import java.util.Scanner;

public class Young {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入年龄: ");
        int age=sc.nextInt();
        if(age < 18){
            System.out.println("少年");
        }else if((age > 19) && (age < 28) ){
            System.out.println("青年");
        }else if((age > 29) && (age < 55)){
            System.out.println("中年");
        }else if( age > 56){
            System.out.println("老年");
        }
    }
}
